what I was trying to say was use existing stuff as an example for your own
I like to use a different music pack everyday so the wider variety of packs there are the happier I get

(sadly there are only two real texture packs atm

)
So good luck with the pack
One thing to watch out for is when you convert a wma file to xnb it might corrupt the music file thus needing to replace it(which is why for my music pack I have copies of EVERYTHING)